See also: Champeaux

Guillaume de Champeaux (Champeaux, 1070 - 1122), bishop of Châlons (out of Champagne) of 1113 with 1122 was a French philosopher and theologist. It took party for realism in the Querelle of the universals. He was the Master of Pierre Abélard, against which he was opposed since he prohibits the " to him; licentia docendi" in Paris.

It was born with Champeaux close to Melun. After having studied under Anselme de Laon and Roscellinus, he taught at the school of the cathedral Our-lady, of which he was made canon in 1103. Among its pupils was Pierre Abélard, to which he was opposed thereafter. In 1108 withdrew itself in the abbey of Saint-Victor, where it took again his conferences. He became then bishop of Châlons-in-Champagne and took share with the argument concerning the nominations like partisan of the Pope Calixte II, which he represented with the conference of Monsoon.

Its only printed work is a fragment on Eucharistie (inserted by Mabillon in its edition of work of Bernard saint) as Moralia has brevi ala and De Origine Animae (in E. Martnes Thesaurus novus Anecdotorum, 1717, vol. 5). In the latter it supports that the children who die not baptized are obligatorily damnés, the pure heart being soiled by the coarseness of the body and it affirms that the will of God should not be questioned. It supports the theory of the creationnism (according to which a heart is especially created for each human being). Ravaisson-Mollien discovered a certain number of fragments of him, among which most important is De Essentia Dei and of Substantia Dei; a Liber Sententiarum, composed of discussions on the ethics and the interpretation of the Bible was also allotted to him.

One regards it as the founder of radical realism, a philosophy which supported as the Universals exist independently as well of the human spirit as particular objects (a philosophy which rose from Platonic realism).